CN2377029Y

CN2377029Y - Multiple-cutting-edge steel plate drill

Info

Publication number: CN2377029Y
Application number: CN 99212679
Authority: CN
Inventors: 朱虎林
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-05-28
Filing date: 1999-05-28
Publication date: 2000-05-10
Anticipated expiration: 2009-05-28

Abstract

The utility model relates to a multi-cutting-edge steel-plate drill which is provided with a cylindrical through-hole in axial direction and is suitable for on-site drilling hollow drills. The external surface of a drill body is provided with a guide spiral edge lobe and a scrap-removal spiral groove. The taper of the external surface with a convergent diameter is arranged from an end face to a drill tail. The taper of an internal surface is opposite to the external surface. The end part of the drill body is provided with a plurality of flat-tooth cutting edges and sharp-tooth cutting edges which are arranged uniformly and alternately in sequence. The utility model has light self weight and small cutting area, adopts the interlaced and separated cutting of flat and sharp cutting edges, and is convenient for inputting cooling liquid in the through-hole of the drill body for cooling. The utility model can realize high speed and facile cutting, can enhance efficiency and lowers power consumption.

Description

Multi-blade Steel Plate Drill

The utility model relates to the drill bit of metal cutting, is specially adapted to the occasion as the on-the-spot drilling steel plate through hole of need that builds a bridge.

At present, fluted drill is generally adopted in steel plate boring, because spiral bit drilling through hole is that completely cutting is carried out in whole hole, the area of cut is big, and heating is severe, has not only limited the cutting speed raising, influences work efficiency, and creeps into effort, and consumed power is big.

The purpose of this utility model provides a kind of Multi-blade Steel Plate Drill of quick cutting, is beneficial to improve work efficiency, reduces power consumption.

The Multi-blade Steel Plate Drill that the utility model provides is the core drill that axially has cylindrical hole, the outer surface that bores body vertically has guiding helical edges lobe and chip removal helicla flute along drill bit, and from end face to boring the tapering that tail has diameter to reduce gradually, the tapering of inner surface is opposite with outer surface, blade is divided into flat serrated knife sword and pointed tooth blade, be distributed in alternate successively with the pointed tooth blade of several flat serrated knife swords bored the body end, two ends of flat serrated knife sword are respectively on inner cylinder face and guiding helical edges lobe, wherein 1/2 blade has recess, the rake face of recess blade is a helicla flute, and flat serrated knife cutlery has side rake angle γ _F1, back rake angle γ _P1, the back knife face of blade recedes and forms back clearance angle α _P1, the blade tip of pointed tooth blade is on the circumference of 1/2 blade place radius of flat tooth, and two ends of blade and overlap with the radius that bores body respectively on inner cylinder face and blade tip in it, and the back rake angle of interior blade is γ _P2, back knife face recedes and forms back clearance angle α _P2, on blade tip and guiding helical edges lobe, the rake face of this blade is a helicla flute to two ends of outer blade respectively, back rake angle is γ _P3, the back knife face of outer blade recedes and forms back clearance angle α _P3

When drill bit drilling steel plate, smear metal is discharged along the helicla flute of blade, and the outer shroud until processed hole drills through, and mentions drill bit, and plug in taking out promptly obtains the aperture through hole identical with the external diameter of Multi-blade Steel Plate Drill.

Multi-blade Steel Plate Drill of the present utility model, because core drill itself is in light weight, adopt flat tooth and pointed tooth to distribute alternately, the separation smear metal that blade is staggered, the area of cut is little, so cut brisk, help improving cutting speed, improve work efficiency, reduce power consumption, adopt multiple-cutting-edge can also improve the stability of cutting simultaneously.

Below in conjunction with accompanying drawing the utility model is further described.

Fig. 1 is the utility model outline drawing;

Fig. 2 is the left view of Fig. 1;

Fig. 3 is that enlarged drawing cuts open in the office of flat serrated knife sword of Fig. 2 and pointed tooth blade;

Fig. 4 is the instantiation that core bar device is got in the utility model configuration;

Fig. 5 is the A-A cross section of Fig. 4.

With reference to Fig. 1, Fig. 2, Fig. 3, Multi-blade Steel Plate Drill is the core drill that axially has cylindrical hole, bore tail cylinder 3 apertures less than boring body cylinder 4 apertures, vertically have guiding helical edges lobe 5 and chip removal helicla flute 6 at the outer surface that bores body along drill bit, outer surface diameter reduces to boring tail gradually from end face, the taper direction of inner surface is opposite with outer surface, blade is divided into flat serrated knife sword and pointed tooth blade, in the illustrated example, have three flat serrated knife swords 1 and three pointed tooth blades 2, alternate successively being distributed in bored the body end, and the rake face of flat serrated knife sword and pointed tooth blade is and the equidirectional inclined-plane of helicla flute that back knife face is the plane.On inner cylinder face 4 and guiding helical edges lobe 5, wherein 1/2 blade has recess to two ends of flat serrated knife sword 1 respectively, and the rake face of recess blade is a helicla flute, generally makes the side rake angle γ of flat serrated knife sword _F1Be 5～10 degree, back rake angle γ _P1Be 25～35 degree, the back clearance angle α of blade _P1Be 7～15 degree.The blade tip of pointed tooth blade is on the circumference of 1/2 blade place radius of flat tooth, and the two ends of blade and overlap with the radius that bores body respectively on inner cylinder face 4 and blade tip in it, and are common, the back rake angle γ of interior blade _P2Be 25～35 degree, back clearance angle α _P2Be 7～15 degree, two ends of outer blade respectively on blade tip and guiding helical edges lobe, its back rake angle γ _P3Be 25～35 degree, back clearance angle α _P3Be 7～15 degree.

Generally make the outer surface that bores tail have two mutually perpendicular planes 7, or internal thread is set, be used for the firm grip drill bit at the brill tail.

Usually, for ease of plug in taking out fast, can comprise core bar device (see figure 4) in the getting of bar 8, spring 9, sleeve 10 boring the tail setting, the brill tail is by the sleeve clamping, bar 8 places and bores the tail cylindrical hole, spring is against bar 8 top and sleeve at 10 the end, and during work, bar 8 withstands on the work piece 12 all the time, the spring stress compression, when hole drill is logical, in imposing on by bar, spring force on the plug, can rapidly interior plug be released drill bit.What preferably make bar vertically has a liquid runner, as shown in Figure 5, round bar the plane vertically arranged, its with bore the tail cylindrical hole and cooperate and form liquid runner 11 cool off so that can in core drill, add cooling fluid, can further improve cutting speed like this.

Multi-blade Steel Plate Drill of the present utility model can adopt high-speed steel integral body to process.

Claims

1. Multi-blade Steel Plate Drill, it is characterized in that it is the core drill that axially has cylindrical hole, the outer surface that bores body vertically has guiding helical edges lobe [5] along drill bit] and chip removal helicla flute [6], and from end face to boring the tapering that tail has diameter to reduce gradually, the tapering of inner surface is opposite with outer surface, blade is divided into flat serrated knife sword [1] and pointed tooth blade [2], be distributed in alternate successively with the pointed tooth blade of several flat serrated knife swords bored the body end, two ends of flat serrated knife sword are respectively on inner cylinder face [4] and guiding helical edges lobe [5], wherein 1/2 blade has recess, the rake face of recess blade is a helicla flute, and flat serrated knife cutlery has side rake angle γ _F1, back rake angle γ _P1, the back knife face of blade recedes and forms back clearance angle α _P1, the blade tip of pointed tooth blade is on the circumference of 1/2 blade place radius of flat tooth, and two ends of blade and overlap with the radius that bores body respectively on inner cylinder face and blade tip in it, and the back rake angle of interior blade is γ _P2, back knife face recedes and forms back clearance angle α _P2, on blade tip and guiding helical edges lobe, the rake face of this blade is a helicla flute to two ends of outer blade respectively, back rake angle is γ _P3, the back knife face of outer blade recedes and forms back clearance angle α _P3

2. by the described Multi-blade Steel Plate Drill of claim 1, it is characterized in that the side rake angle γ of flat serrated knife sword rake face _F1Be 5～10 degree, back rake angle γ _P1Be 25～35 degree, back clearance angle α _P1Be 7～15 degree.

3. by the described Multi-blade Steel Plate Drill of claim 1, it is characterized in that the back rake angle γ of the interior blade of pointed tooth blade _P2Be 25～35 degree, back clearance angle α _P2Be 7～15 degree, the back rake angle γ of outer blade _P3Be 25～35 degree, back clearance angle α _P3Be 7～15 degree.

4. by the described Multi-blade Steel Plate Drill of claim 1, it is characterized in that boring the cylinder aperture of tail less than the cylinder aperture that bores body.

5. by the described Multi-blade Steel Plate Drill of claim 1, it is characterized in that boring the tail outer surface and have two mutually perpendicular planes [7] or have internal thread.

6. by the described Multi-blade Steel Plate Drill of claim 1, it is characterized in that boring the interior core bar device of getting that the tail setting comprises bar [8], spring [9], sleeve [10], bore tail by the sleeve clamping, bar [8] places and bores the tail cylindrical hole, between spring is against at the bottom of masthead and the sleeve.

7. by the described Multi-blade Steel Plate Drill of claim 6, it is characterized in that bar [8] vertically has the liquid runner.

8. by the described Multi-blade Steel Plate Drill of claim 1, it is characterized in that Multi-blade Steel Plate Drill adopts high-speed steel integral body to process.